Stephen Alderton's callous refusal to answer questions over the murder of father and son Gary, 57, and Joshua Dunmore, 32, will be shown in the second episode of 24 Hours In Police Custody: A Family Vendetta airs on Channel 4 at 9pm tonight

This is the moment a widower who "executed" a father and son remains stony-faced as he is confronted with chilling details of the double murder .

Stephen Alderton, 67, blasted his daughter's ex-partner Josh Dunmore, 32, and his 57-year-old dad Gary with a Beretta shotgun after a bitter custody battle over Alderton's grandson. Police footage following his arrest - shared with the Mirror - is revealed in a new episode of Channel 4's hit series 24 Hours In Police Custody being aired tonight.

In never-before-seen interviews, detectives quiz murd

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